from rest_framework.views import exception_handler as drf_exception_handler
import logging
from django.db import DatabaseError
from redis.exceptions import RedisError
from rest_framework.response import Response
from rest_framework import status

logger = logging.getLogger('django')


def exception_handler(exc, context):
    '''
    自定义异常处理,当视图有异常的时候，他会自动执行里边的代码，当下边的代码出现
    异常为DatabaseError或者RedisError时候，会将日志进行添加，并返回给服务器一个507错误，并且返回差错信息
    :param exc: 异常
    :param context: 抛出异常的上下文
    :return: Response响应对象
    '''
    response = drf_exception_handler(exc, context)

    if response is None:
        view = context['view']
        if isinstance(exc, DatabaseError) or isinstance(exc, RedisError):
            logger.error('[%s] %s' % (view, exc))
            response = Response({'message': '服务器内部错误'}, status=status.HTTP_507_INSUFFICIENT_STORAGE)

    return response
